[][src]Crate tinyvec

tinyvec provides 100% safe vec-like data structures.

Provided Types

With no features enabled, this crate provides the ArrayVec type, which is an array-backed storage. You can push values into the array and pop them out of the array and so on. If the array is made to overflow it will panic.

Similarly, there is also a SliceVec type available, which is a vec-like that's backed by a slice you provide. You can add and remove elements, but if you overflow the slice it will panic.

With the alloc feature enabled, the crate also has a TinyVec type. This is an enum type which is either an Inline(ArrayVec) or a Heap(Vec). If a TinyVec is Inline and would overflow it automatically transitions itself into being Heap mode instead of a panic.

All of this is done with no unsafe code within the crate. Technically the Vec type from the standard library uses unsafe internally, but this crate introduces no new unsafe code into your project.

The limitation is that the element type of a vec from this crate must support the Default trait. This means that this crate isn't suitable for all situations, but a very surprising number of types do support Default.


The general goal of the crate is that, as much as possible, the vecs here should be a "drop in" replacement for the standard library Vec type. We strive to provide all of the Vec methods with the same names and signatures. The "exception" is of course that the element type of each method will have a Default bound that's not part of the normal Vec type.

The vecs here also have additional methods that aren't on the Vec type. In this case, the names tend to be fairly long so that they are unlikely to clash with any future methods added to Vec.


tinyvec is starting to get some real usage within the ecosystem! The more popular you are, the less people want you breaking anything that they're using.

  • With the 0.4 release we had to make a small breaking change to how the vec creation macros work, because of an unfortunate problem with how rustc was parsing things under the old syntax.

If we don't have any more unexpected problems, I'd like to declare the crate to be 1.0 by the end of 2020.



Helper to make an ArrayVec.


Helper to make a TinyVec.



An array-backed set


An array-backed, vector-like data structure.


Draining iterator for ArrayVec


Iterator for consuming an ArrayVec and returning owned elements.


Splicing iterator for ArrayVec See ArrayVec::splice


Error resulting from attempting to insert into a full array


Type returned by ArraySet::iter


A slice-backed vector-like data structure.


Draining iterator for SliceVec


Draining iterator for TinyVecDrain


Splicing iterator for TinyVec See TinyVec::splice



A vector that starts inline, but can automatically move to the heap.


Iterator for consuming an TinyVec and returning owned elements.



A trait for types that are an array.